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Antioxidant-rich beetroot juice does not adversely affect acute neuromuscular adaptation following eccentric exercise

Lookup NU author(s): Dr Tom Clifford, Dr Daniel West, Professor Emma Stevenson

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Routledge, 2017.

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Abstract

© 2016 Informa UK Limited, trading as Taylor & Francis Group. This study examined the effects of beetroot juice on the repeated bout effect (RBE) to eccentric exercise. Twenty-nine recreationally active males performed two bouts of 100-drop jumps, separated by 14–21 days. Using a double-blind, independent groups design, participants consumed either a higher dose beetroot juice (H-BT; 250 ml, n = 10), a lower dose beetroot juice (L-BT; 125 ml, n = 9) or an isocaloric placebo (PLA; 250 ml, n = 10) for 3 days after bout 1; no drinks were consumed after bout 2. Maximal isometric voluntary contraction (MIVC), countermovement jump (CMJ), pressure-pain threshold (PPT) and creatine kinase (CK) were measured pre, post, 24, 48 and 72 h following both bouts. In bout 2, CMJ and MIVC recovered quicker and CK activity was attenuated (versus bout 1) (P < 0.05) in all groups, demonstrating an RBE. At 24 h post bout 1, MIVC was 84.1 ± 16.1, 83.6 ± 11.6, 79.7 ± 15.1% relative to baseline values in the H-BT, L-BT and PLA groups, respectively; at 24 h post bout 2, MIVC recovered to 90.7 ± 13.7, 92.9 ± 6.9, 87.8 ± 6.9, in the H-BT, L-BT and PLA groups, respectively. These findings suggest that supplementation with antioxidant-rich beetroot juice does not adversely affect acute adaptations to a bout of eccentric exercise.


Publication metadata

Author(s): Clifford T, Bell O, West DJ, Howatson G, Stevenson EJ

Publication type: Article

Publication status: Published

Journal: Journal of Sports Sciences

Year: 2017

Volume: 35

Issue: 8

Pages: 812-819

Online publication date: 07/06/2016

Acceptance date: 18/05/2016

Date deposited: 22/08/2018

ISSN (print): 0264-0414

ISSN (electronic): 1466-447X

Publisher: Routledge

URL: https://doi.org/10.1080/02640414.2016.1192670

DOI: 10.1080/02640414.2016.1192670


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